Epitaxial growth of titanium oxycarbide on MgO (001) substrates by pulsed laser deposition

Binh, Huy; Yen, Tzu Chun; Tian, Chih Sheng; Wu, Yue; Chang, Li

doi:10.1016/j.apsusc.2010.10.105

Cited by 8 publications

(4 citation statements)

References 33 publications

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“…After 2 min of treatment, the amount of oxygen in the sample starts to decrease (not shown), and the newly created vacancies are replaced by carbon atoms (i.e., an uptake of carbon is occurring). This is well evident from the new component in the C 1s peak that starts to appear at a BE of 282 eV, associated with Ti−C bonds, 33,34 whose intensity is increasing with time. After the last treatment (sample 9), the C 1s peak only shows a very small component at 285 eV, which can be attributed either to remaining carbon contamination or to the extra carbon on the surface coming from the decomposition of the ethylene.…”

Section: ■ Results and Discussionmentioning

confidence: 81%

“…After the last treatment (sample 9), the C 1s peak only shows a very small component at 285 eV, which can be attributed either to remaining carbon contamination or to the extra carbon on the surface coming from the decomposition of the ethylene. Regarding the Ti 2p region, a new component at 455 eV, attributed to TiC and/or TiO, 33 starts to appear at 823 K, but the characteristic peaks of oxidized TiO 2 are still predominant. However, after 6 min of treatment (sample 9), the amount of TiO x phases decreases considerably, whereas the amount of TiC/TiO phases increases.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Carbothermal Transformation of TiO₂ into TiO_xC_y in UHV: Tracking Intrinsic Chemical Stabilities

et al. 2014

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International audienceThe conversion of anodic TiO2 films into TiOxCy in ultrahigh-vacuum (UHV) has been traced by photoemission spectroscopy in order to optimize the process parameters and study the different phase stabilities. In addition, density functional theory (DFT) calculations have been performed in order to elucidate the main questions about TiOxCy composition and stability. The experimental data indicate that the anodic TiO2 film is stable both in UHV and ethylene background up to ca. 600 K, and at this temperature, it starts to reduce leading to suboxide TiOx species. Above ca. 750 K, the formation of TiOxCy starts, since the oxygen vacancies begin to be replaced by carbon atoms. A surface enrichment in TiO2 and elemental carbon has been detected on the converted TiOxCy film at room temperature. Real-time measurements have shown that this phenomenon takes place during the cool down process and DFT calculations suggest a possible explanation: as the temperature decreases below ca. 750 K (temperature at which the formation of TiOxCy starts), the TiOxCy phase is not thermodynamically stable, and it decomposes into TiO2 and elemental carbon. The comparison of the experimental valence band data with DFT results has also allowed to establish that the film surface is not homogeneous and that segregation of TiO and TiC systems may take place. On the other hand, the local compositional study carried out by scanning photoelectron microscopy has shown that the conversion of the film is not homogeneous but depends on the grain orientation, in particular crystallites with an orientation close to <2<(11)over bar>0> and <10<(1)over bar>0> planes show a higher grade of conversion. Both experimental and DFT data validate the use of TiOxCy as an innovative support for electrocatalysis

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Section: ■ Results and Discussionmentioning

confidence: 81%

Section: ■ Results and Discussionmentioning

confidence: 99%

Carbothermal Transformation of TiO₂ into TiO_xC_y in UHV: Tracking Intrinsic Chemical Stabilities

et al. 2014

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“…After the laser irradiation (Figure 3b), another peak at lower binding energies was detected, around 454 eV. According to the literature, this peak can be ascribed to TiC [49,50,51]. No significant evidence of other peaks after the laser treatment were detected on the analysed samples.…”

Section: Resultsmentioning

confidence: 69%

Creation of Superhydrophobic and Superhydrophilic Surfaces on ABS Employing a Nanosecond Laser

2018

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A nanosecond green laser was employed to obtain both superhydrophobic and superhydrophilic surfaces on a white commercial acrylonitrile-butadiene-styrene copolymer (ABS). These wetting behaviors were directly related to a laser-induced superficial modification. A predefined pattern was not produced by the laser, rather, the entire surface was covered with laser pulses at 1200 DPI by placing the sample at different positions along the focal axis. The changes were related to the laser fluence used in each case. The highest fluence, on the focal position, induced a drastic heating of the material surface, and this enabled the melted material to flow, thus leading to an almost flat superhydrophilic surface. By contrast, the use of a lower fluence by placing the sample 0.8 µm out of the focal position led to a poor material flow and a fast cooling that froze in a rugged superhydrophobic surface. Contact angles higher than 150° and roll angles of less than 10° were obtained. These wetting behaviors were stable over time.

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“…Titanium oxycarbide films have been studied extensively as decorative materials with narrow color range (black) [4], whereas, the potential applications in mechanical, medical and photocatalytic filed are rarely studied. Various methods have been used to prepare titanium oxycarbide films, including magnetron sputtering [5][6][7], sol-gel, electrophoretic deposition [8] and pulsed laser [9]. Because of the high affinity of O with Ti, phase transition usually occurs through tuning experimental parameters, such as reactive gas pressure [6,10] and substrate negative bias [11] to control the O/Ti ratio in films, It's worth mentioning that FCVA technique is a superior method equipped with several controllable experimental parameters, such as reactive gas flow rate, substrate negative bias, filtered coil current, in order to obtain a high quality film.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional titanium oxycarbide films fabricated by filtered cathodic vacuum arc technique using CO2 as a precusor

Zhou

Liao

et al. 2015

Ceramics International

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Epitaxial growth of titanium oxycarbide on MgO (001) substrates by pulsed laser deposition

Cited by 8 publications

References 33 publications

Carbothermal Transformation of TiO₂ into TiO_xC_y in UHV: Tracking Intrinsic Chemical Stabilities

Carbothermal Transformation of TiO₂ into TiO_xC_y in UHV: Tracking Intrinsic Chemical Stabilities

Creation of Superhydrophobic and Superhydrophilic Surfaces on ABS Employing a Nanosecond Laser

Multifunctional titanium oxycarbide films fabricated by filtered cathodic vacuum arc technique using CO2 as a precusor

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Epitaxial growth of titanium oxycarbide on MgO (001) substrates by pulsed laser deposition

Cited by 8 publications

References 33 publications

Carbothermal Transformation of TiO2 into TiOxCy in UHV: Tracking Intrinsic Chemical Stabilities

Carbothermal Transformation of TiO2 into TiOxCy in UHV: Tracking Intrinsic Chemical Stabilities

Creation of Superhydrophobic and Superhydrophilic Surfaces on ABS Employing a Nanosecond Laser

Multifunctional titanium oxycarbide films fabricated by filtered cathodic vacuum arc technique using CO2 as a precusor

Contact Info

Product

Resources

About

Carbothermal Transformation of TiO₂ into TiO_xC_y in UHV: Tracking Intrinsic Chemical Stabilities

Carbothermal Transformation of TiO₂ into TiO_xC_y in UHV: Tracking Intrinsic Chemical Stabilities